51121643134221 has 24 divisors (see below), whose sum is σ = 80563343855904. Its totient is φ = 30979726558560.

The previous prime is 51121643134169. The next prime is 51121643134229. The reversal of 51121643134221 is 12243134612115.

51121643134221 is a `hidden beast` number, since 5 + 1 + 1 + 2 + 1 + 643 + 1 + 3 + 4 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 51121643134221 - 2⁶ = 51121643134157 is a prime.

It is a super-2 number, since 2×51121643134221² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121643134229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24730171 + ... + 26717496.

It is an arithmetic number, because the mean of its divisors is an integer number (3356805993996).

Almost surely, 2^{51121643134221} is an apocalyptic number.

It is an amenable number.

51121643134221 is a deficient number, since it is larger than the sum of its proper divisors (29441700721683).

51121643134221 is a wasteful number, since it uses less digits than its factorization.

51121643134221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51457721 (or 51457718 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

Adding to 51121643134221 its reverse (12243134612115), we get a palindrome (63364777746336).

The spelling of 51121643134221 in words is "fifty-one trillion, one hundred twenty-one billion, six hundred forty-three million, one hundred thirty-four thousand, two hundred twenty-one".